BS EN 50468:2009 BSI British Standards Resistibility requirements to overvoltages and overcurrents due to lightning for equipment having telecommunication ports NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW raising standards worldwide™ BRITISH STANDARD BS EN 50468:2009 National foreword This British Standard is the UK implementation of EN 50468:2009 The UK participation in its preparation was entrusted to Technical Committee GEL/81, Protection against lightning A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © BSI 2009 ISBN 978 580 56040 ICS 29.120.50; 91.120.40 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2009 Amendments issued since publication Amd No Date Text affected BS EN 50468:2009 EUROPEAN STANDARD EN 50468 NORME EUROPÉENNE EUROPÄISCHE NORM April 2009 ICS 29.120.50; 91.120.40 English version Resistibility requirements to overvoltages and overcurrents due to lightning for equipment having telecommunication ports Exigences de tenue aux surtensions et aux surintensités dues la foudre pour les matériels avec port de communication Anforderungen zur Zerstörfestigkeit von Einrichtungen mit Telekommunikationsanschluss gegen Überspannungen und -ströme infolge Blitzschlags This European Standard was approved by CENELEC on 2009-02-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: avenue Marnix 17, B - 1000 Brussels © 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 50468:2009 (fragment 60) E BS EN 50468:2009 EN 50468:2009 –2– Foreword This European Standard was prepared by the Technical Committee CENELEC TC 81X, Lightning protection The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50468 on 2009-02-01 The following dates were fixed: – – latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement latest date by which the national standards conflicting with the EN have to be withdrawn (dop) 2010-02-01 (dow) 2012-02-01 BS EN 50468:2009 –3– EN 50468:2009 Contents Scope Normative references Terms, definitions and abbreviations Reference configuration 5 Resistibility requirements 6 Resistibility test requirements 6.1 For ports connected to balanced copper cabling 6.1.1 Lightning test conditions for ports connected to external balanced copper cabling 6.2 For ports connected to external d.c or a.c dedicated power feeding cables 6.2.1 Lightning test conditions for ports connected to external d.c or a.c dedicated power feeding cables 6.3 For mains power ports 6.3.1 Test conditions for mains power ports Annex A (informative) ITU-T publications (K-recommendations) with relation to TE 10 Bibliography 11 Figures ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure – Equipment with telecommunication ports installed at customers premises Figure – TE configurations Figure A.1 – ITU-T publications (K-recommendations) with relation to TE 10 BS EN 50468:2009 EN 50468:2009 –4– Scope This European Standard specifies the minimum level of resistibility of equipment having telecommunication port(s) to overvoltages and overcurrents This European Standard covers telecommunication equipment installed at customer premises as shown in Figure Overvoltages or overcurrents covered by this European Standard are surges due to direct or indirect lightning on the telecommunication line plant Overvoltages or overcurrent not covered by this European Standard are – short-term induction of alternating voltages from electric power systems (including electrified railway), – earth potential rise due to power faults or load switching, – direct contacts between telecommunication lines and low voltage power lines This European Standard is intended for use by network (public/private) operators and the equipment manufacturers This European Standard applies to equipment having telecommunication port(s) connected to external conductors, i.e conductor located outside the customer’s building The tests are type tests and, although they are applicable to a complete system, it is recognised that they may be applied to individual items of equipment during development and design work Normative references ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies CLC/TR 50450:2006, Resistibility requirements for equipment having (a) telecommunication port(s) EN 60950-1:2006, Information technology equipment – Safety – Part 1: General requirements (IEC 60950-1:2005, mod.) IEC 60050-701:1988, International Electrotechnical Vocabulary (IEV) – Chapter 701: Telecommunications, channels and networks ITU-T Recommendation K.21, Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents ITU-T Recommendation K.44, Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents – Basic Recommendation BS EN 50468:2009 –5– EN 50468:2009 Terms, definitions and abbreviations For the purposes of this document, the following terms and definitions apply, in addition with those definitions and abbreviations in ITU-T recommendation K.44 3.1 resistibility ability of telecommunication equipment or installations to withstand, in general without damage, the effects of overvoltages or overcurrents, up to a certain, specified extent, and in accordance with a specified criterion [ITU-T K.44] NOTE Two acceptance criteria are recognized: Criterion A – Equipment shall withstand the test without damage or other disturbance (such as corruption of software or misoperation of fault-protection facilities) and shall operate properly within the specified limits after the test It is not required to operate correctly during the test Criterion B – A fire hazard shall not arise in the equipment as a result of the tests Any damage, if it occurs, shall be confined to a small part of the equipment 3.2 telecommunication port port which is intended to be connected to telecommunication networks, Local Area Networks (e.g Ethernet, Token Ring) and similar networks, either through physical connection (cable optical fibre) or radio connection [CLC/TR 50450] NOTE In the latter case the antenna port is the telecommunication port 3.3 external ports particular interface of the specified equipment, which is directly connected to metallic conductors extending beyond the building or shelter boundary ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ [ITU-T K.44] 3.4 internal ports particular interface of the specified equipment which is connected to metallic conductors which not leave the building or shelter These interfaces connect to cables which interconnect system blocks [ITU-T K.44] 3.5 telecommunication any transmission, emission or reception of signs, signals, writing, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems [IEV 701-01-05 of IEC 60050-701:1988] Reference configuration The diagram below shows equipment with telecommunication port(s) installed at customers premises This ensures that the appropriate electromagnetic environment for the installation is considered, independent of the ownership of the equipment BS EN 50468:2009 EN 50468:2009 –6– E E S1 MDF Metallic connection NT M Key E S M NT MDF TE Exchange building Customers premises Equipment e.g Multiplexor Network Termination Main Distribution Frame Terminal Equipment Radio link S3 TE NT Metallic connection Non metallic connection S2 TE Figure – Equipment with telecommunication ports installed at customers premises Resistibility requirements ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ For equipment having only external telecommunications ports the resistibility requirements are defined in ITU-T K.21, "Basic test level" See also Figure 2, a) For equipment having additional connections to networks, e.g power networks, the test levels are defined in ITU-T K.21, "Enhanced test level" See also Figure 2, b) to e) The inherent resistibility of the equipment may not be sufficient by itself, requiring co-ordinated primary protection to be fitted to fully comply NOTE For the external port, the probability of overvoltages and overcurrents on the equipment is determined by – the length of the line and the environment it is installed in, – the environment outside of the structure, and the structure itself Resistibility test requirements An overview of the test conditions for the different ports is shown in 6.1 to 6.3 See also Figure for identification of the ports In Annex A is listed the relevant ITU specifications on this topic The complete test requirements, test generators, test circuits, test conditions, coupling and decoupling elements and port terminations are provided in ITU-T K.21 and K.44 During test the level of overvoltages and overcurrents in untested ports shall not exceed the requirements in EN 60950-1 Gas discharge tubes with 600 V nominal d.c spark-over voltage are used as special test protector in the co-ordination test on external telecommunication port(s) BS EN 50468:2009 –7– 6.1 EN 50468:2009 For ports connected to balanced copper cabling 6.1.1 Lightning test conditions for ports connected to external balanced copper cabling Test No Test No ITU-T K.21 Test description ITU-T K.21 Basic test levels Enhanced test levels 6.1.1.1 2.1.1.a Single port, lightning, inherent, transverse Uc(max) = 1,5 kV Uc(max) = 1,5 kV 6.1.1.2 2.1.1.b Single port, lightning, inherent, port to earth Uc(max) = 1,5 kV Uc(max) = kV 6.1.1.3 2.1.1.c Single port, lightning, inherent, port to external port Uc(max) = 1,5 kV Uc(max) = kV 6.1.1.4 2.1.2.a Single port, lightning, coordination, transverse Uc(max) = kV Uc(max) = kV 6.1.1.5 2.1.2.b Single port, lightning, coordination, port to earth Uc(max) = kV Uc(max) = kV 6.1.1.6 2.1.2.c Single port, lightning, coordination, port to external port Uc(max) = kV Uc(max) = kV 6.1.1.7 2.1.3.a Multiple port, lightning, inherent, Uc(max) = 1,5 kV port to earth Uc(max) = 1,5 kV 6.1.1.8 2.1.3.b Multiple port, lightning, inherent, Uc(max) = 1,5 kV port to external port Uc(max) = 1,5 kV 6.1.1.9 2.1.4.a Multiple port, lightning coordination, port to earth Uc(max) = kV Uc(max) = kV 6.1.1.10 2.1.4.b Multiple port, lightning coordination, port to external port Uc(max) = kV Uc(max) = kV 6.1.1.11 2.1.5.a Single port, lightning current, port to earth I = kA/wire I = kA/wire 6.1.1.12 2.1.5.b Single port, lightning current, port to external port I = kA/wire I = kA/wire 6.1.1.13 2.1.6.a Multiple port, lightning current, port to earth I = kA/wire Limited to kA total I = kA/wire Limited to 30 kA total 6.1.1.14 2.1.6.b Multiple port, lightning current, port to external port I = kA/wire a Limited to kA total I = kA/wire a Limited to 30 kA total a ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Peak current is set by the weaker of the port under test and the external port coupled to ground BS EN 50468:2009 EN 50468:2009 6.2 –8– For ports connected to external d.c or a.c dedicated power feeding cables 6.2.1 Lightning test conditions for ports connected to external d.c or a.c dedicated power feeding cables Test No Test No ITU-T K.21 Test description ITU-T K.21 Basic test levels Enhanced test levels 6.2.1.1 4.1.1.a Single port, lightning, inherent, transverse Uc(max) = 1,5 kV Uc(max) = 1,5 kV 6.2.1.2 4.1.1.b Single port, lightning, inherent, port to earth Uc(max) = 1,5 kV Uc(max) = kV 6.2.1.3 4.1.1.c Single port, lightning, inherent, port to external port Uc(max) = 1,5 kV Uc(max) = kV 6.2.1.4 4.1.2.a Single port, lightning, coordination, transverse Uc(max) = kV Uc(max) = kV 6.2.1.5 4.1.2.b Single port, lightning, coordination, port to earth Uc(max) = kV Uc(max) = kV 6.2.1.6 4.1.2.c Single port, lightning, coordination, port to external port Uc(max) = kV Uc(max) = kV 6.2.1.7 4.1.5.a Single port, lightning current, port to earth I = kA/wire I = kA/wire 6.2.1.8 4.1.5.b Single port, lightning current, port to external port I = kA/wire I = kA/wire 6.3 For mains power ports 6.3.1 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Test conditions for mains power ports Test No Test No ITU-T K.21 Test description ITU-T K.21 Basic test levels Enhanced test levels 6.3.1.1 5.1.1.a Lightning, inherent, transverse Uc(max) = 2,5 kV Uc(max) = kV 6.3.1.2 5.1.1.b Lightning, inherent, port to earth Uc(max) = 2,5 kV Uc(max) = kV 6.3.1.3 5.1.1.c Lightning, inherent, mains port to external port Uc(max) = 2,5 kV Uc(max) = kV 6.3.1.4 5.1.2.a Lightning, coordination, transverse Uc(max) = kV Uc(max) = 10 kV 6.3.1.5 5.1.2.b Lightning, coordination, port to earth Uc(max) = kV Uc(max) = 10 kV 6.3.1.6 5.1.2.c Lightning, coordination, mains port to external port Uc(max) = kV Uc(max) = 10 kV BS EN 50468:2009 –9– (external) telecommunication port(s) EN 50468:2009 TE a) (external) telecommunication port(s) TE (internal) telecommunication port(s) b) (external) telecommunication port(s) TE mains / power feed c) (external) telecommunication port(s) ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ TE mains / power feed (internal) telecommunication port(s) d) (external) telecommunication port(s) glasfibre; radio link TE (internal) telecommunication port(s) e) Key TE Terminal Equipment Figure – TE configurations mains / power feed BS EN 50468:2009 EN 50468:2009 – 10 – Annex A (informative) ITU-T publications (K-recommendations) with relation to TE Lightning protection K.11 General K.25 Optical fibre cables K.46, K.47 Metallic cables K.44 Basics, Resistibility tests Lightning handbook Lightning protection none Mains induced K.11 Principles K.26 Protection K.44 Basics, Resistibility tests K.53 Values of induced voltages K.54 Test methods Directive 1999/5/EC Mains induced n.a Surge protection devices K.12 GDT K.26 Protection K.28 Semi-conductor protectors K.30 PTC K.36 Selection of SPD Directive 1999/5/EC Surge protection devices none Resistibility requirements K.21 Customers equipment (external) telecommunication port(s) ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Resistibility requirements K.21 Customers equipment TTE mains / power feed (internal) telecommunication port(s) Key TTE Telecommunication Terminal Equipment Figure A.1 – ITU-T publications (K-recommendations) with relation to TE BS EN 50468:2009 – 11 – EN 50468:2009 Bibliography EN 50174-1, Information technology – Cabling installation – Part 1: Specification and quality assurance EN 50174-2, Information technology – Cabling installation – Part 2: Installation planning and practices inside buildings EN 50174-3, Information technology – Cabling installation – Part 3: Installation planning and practices outside buildings EN 61663-2, Lightning protection – Telecommunication lines – Part 2: Lines using metallic conductors (IEC 61663-2) ITU-T Recommendation K.11, Principles of protection against overvoltages and overcurrents ITU-T Recommendation K.12, Characteristics of gas discharge tubes for the protection of telecommunications installations ITU-T Recommendation K.25, Protection of optical fibre cables ITU-T Recommendation K.26, Protection of telecommunication lines against harmful effects from electric power and electrified railway lines ITU-T Recommendation K.28, Characteristics of semi-conductor arrester assemblies for the protection of telecommunications installations ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ ITU-T Recommendation K.30, Self-restoring overcurrent protectors ITU-T Recommendation K.36, Selection of protective devices ITU-T Recommendation K.46, Protection of telecommunication lines using metallic symmetric conductors against lightning-induced surges ITU-T Recommendation K.47, Protection of telecommunication lines using metallic conductors against direct lightning discharges ITU-T Recommendation K.53, Values of induced voltages on telecommunication installations to establish telecom and a.c power and railway operators responsibilities ITU-T Recommendation K.54, Conducted immunity test method and level at fundamental power frequencies ITU-T Recommendation K.66, Protection of customer premises from overvoltages Directive 1999/5/EC, RTTE – Radio Equipment and Telecommunications Terminal Equipment and the mutual recognition of their conformity ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ This page deliberately left blank ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ This page deliberately left blank British Standards Institution (BSI) BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions Information on standards British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve 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